Spray nozzle



Feb. 24, 1953 Filed Oct. 28, 1948 R. H. MUNSON SPRAY NOZZLE 2SHEETS-SHEET l INVENTOR.

RALPH H. MUNSON ATTORNEY Feb. 24, 1953 R. H. MUNSON SPRAY NOZZLE FiledOct. 28, 1948 2 SHEETSSHEET 2 JNVENTOR. RALPH H. MUNSON ATTORNEYPatented Feb. 24, 1953 UNITED STATES PATENT OFFICE 2 Claims.

My invention relates to an improvement in a spray nozzle and a method offorming the orifice of the nozzle.

It is an object of my invention to provide a nozzle which produces aneven and consistent spray of liquid material, and which allows longperiods of use with a minimum of cleaning and wear.

It is a further object of my invention to provide a nozzle which willdirect a spray within a given area and at a selected angle. It is anadditional object of my invention to provide a nozzle having a screen ofsufficient area to prevent foreign matter in suspension in a liquid fromclogging the respective parts of the nozzle.

It is a further and primary object to provide an adequate support forthe screen, which in addition to supporting the screen, directs the flowof liquid in a straight path to the orifice of the nozzle, it havingbeen found that the straighter the path of the flow of the liquid, theless tendency of particles to come out of suspension and thereby clogthe nozzle.

An additional feature lies in providing chamfered edges in the screenreceiving means so that foreign particles cannot pass around the edgesof the screen and be carried to the orifice of the nozzle.

It is a primary feature of my invention to provide a metering jet dischaving a metered hole therein which controls the amount of liquid goingto the nozzle orifice and which also creates a stream which flows fromthe hole in the metering disc to the orifice through the liquid presentbetween the metering disc and the nozzle orifice. ;A turbulence is setup around the stream or flow from the metering disc hole to the orifice.This turbulence prevents particles in suspension from coming out ofsuspension and piling up near the orifice and thereby clogging the same.

A further feature resides in providing a threaded cylinder supportingcollar which supports the metering jet disc. The supporting collar isthreadedly engaged within the nozzle tip thereby allowing removal forcleaning the same and also the area adjacent the inner end of the tiporifice. It is a feature to engage the nozzle tip with the nozzle tipadapter by means of a nozzle tip retaining compression nut so that thetip may be adjusted with relation to the remainder of the nozzle.

It is a further primary object of my invention to provide a method forforming the orifice of the nozzle tip which consists in bobbing adepression in the inner bottom surface of the nozzle tip by means of apunch press or similar means actuating the hobbing element. The hobbedhole is parabolically curved in the bottom thereof. A milled V-cut isthen made through the tip of the nozzle of such a depth that a portionof the bottom of the hobbed depression is thereby exposed forming thenozzle orifice. The size and shape of the orifice depends upon theamount of the hobbed depression being milled away. An elliptical orificeis created whenit is desired to produce a fan spray, and the ellipticalorifice is produced when the lower portion of a parabolical- 1y curvedhobbed depression is cut away. The metal surrounding the 'hobbeddepression or recess has increased density as a result of the hobbingand as a result is hardened. The orifice subsequently made by milling achannel or cut through the bottom of the hobbecl recess has hardenededges which give long life to the orifice in resisting the wearingaction of the spray liquid on the edges of the orifice.

These objects, together with other details and objects will be moreclearly defined in the following specification and claims.

Figure 1 is a longitudinal view of the nozzle inserted in a supply pipeboom. shown in section.

Figure 2 is a bottom end view thereof.

Figure 3 is a top end view thereof.

Figure 4 is a perspective view of the fluted screen support.

Figure 5 is a perspective view of a series of nozzles supported by asupply pipe boom showing a manner of spraying.

Figure 6 is a section on the line 6--6 of Figure 1.

Figure 7 is an exploded perspective View of the nozzle and its componentparts extended in alignment with each other.

Figure 8 is a section on the line 8-8 of Figure 6.

Figure 9 is an alternative form of screen support.

Figure 10 is a section of the nozzle tip showing the hobbed recessformed therein with the hobbing tool partially elevated.

Figure 11 is an enlarged section of a portion of the nozzle tip showingthe shape of the hobhed recess formed in the nozzle tip.

Figure 12 is an enlarged detailed portion of the bottom of the nozzleillustrating the elliptical orifice therein. Y

My nozzle A consists of a nozzle tip [0 which was formed thereon theannular shoulder H. The angular chamfered shoulder I2 is formed adjacentthe annular shoulder II. The forward portion 13 of the nozzle tip l2adjacent the annular shoulder H is of a diameter less than the shoulderThe extreme lower end I4 of the nozzle is cylindrical in shape. Thenozzle tip H] has the threads |5 formed internally thereof. The orifice6 is formed centrally through the tip end M in a manner hereinafterdescribed. The inner end of the nozzle tip H! has a chamfered shoulderformed therein as at IT.

A threaded cylindrical supporting collar I8 is threadedly engaged withthe threads |5 of the tip l0, and positioned in the inner bottom of thenozzle tip Ill. The collar H! has secured therein, the metering jet discH3 in which is formed the metered hole l9. The collar |8 is screwed intothe tip ID by means of the slots formed in the upper rim of the collarl0 and thus may be removed for cleaning of the area adjacent the innerend of the orifice IS. The disc I9 is positioned away from the loweredge of the support collar |8 thereby forming the compartment 2| justabove the orifice IS. The spray fluid fills the compartment 2| when thenozzle is in operation, there being a stream or flow of fluid from themetered hole |9 directly to the orifice 56. In addition to the flowabove-mentioned, turbulence is set up in the compartment or chamber 2|,which turbulence will tend to dislodge any foreign particles 01'particles of chemical out of suspension which may be lodged adjacent theinner opening of the orifice Hi.

The screen support 22 is cylindrical in shape and has the flutes 23formed longitudinally in the outer surface thereof. Formed on the lowerend of the screen support 22 are the threads 24 which engage with thethreads I5 formed in the nozzle tip [0, thereby supporting the screensupport 22 on the nozzle tip I0. It is obvious that the threads 24 maynot be formed as deeply as the flutes 23 so that there may be a passageof fluid down the flutes and beneath the joinder of the threads l5 and24. The upper end of the screen support is drilled and tapped to receivethe screw cap 25. An annular beveled or chamfered edge 26 is formed onthe under side of the screw cap 25 which engages and tends to crimpslightly the upper end of the cylindrical screen 2'! when the cap 25 isscrewed tightly upon the upper end of the screen support 22. As aresult, the screen is securely held upon the screen support 22 and theabove mentioned crimp of the screen against the annular shoulder 26thereby prohibits the upper end of the screen 21 from becoming frayedand makes a positive contact between the upper end of the screen 21 andthe cap 25. The lower edge of the screen 2! is forced against the charmfered annular shoulder IT to force the edge of.

the screen inwardly against the screen support 22, and also to preventthe lower edge of the screen 21 from being frayed and admit particles tothe nozzle tip. The lower edge of the screen 21 is forced against theshoulder I! when the screen 21 is placed on the support 22 and thesupport 22 is screwed into the threads I5, the cap 25 being in atightened position.

The screen 2'! is evenly and firmly supported throughout by thelongitudinal top surface portions 22' which separate the flutes 23.Collapse of or injury to the screen is virtually impossible. As theliquid passes through the screen 21, it flows downwardly through theflutes 23 in a straight path towards the metering disc l9 and theorifice l6. It has been found that the straighter the path of the flowof liquid, the less the tendency for the chemical in suspension to comeout of suspension. It has been foundthat 4 where the flow of liquidmixture is more or less circuitous, the particles in suspension may comeout of suspension and pile up at points of curve in the flow of theliquid.

An alternative form of screen support is shown in the form of a helicalspring 28 which is positioned within the screen 21.

The nozzle tip adapter 29 is generally cylindrical in shape and hasformed on the lower inner edge thereof, the bevelled shoulder 30 whichis adapted to engage with the shoulder l2. The threads 3| are formed onthe lower portion of the nozzle tip adapter 29 and adapted to engagewith the threads formed on the inner surface of the nozzle tip retainingnut 32. The retaining nut 32 has formed therein the shoulder 33 whichengages with the lower shoulder 34 of the nozzle tip l0. As theretaining nut 32 is drawn up on the threads 3| of the nozzle tip adapter29, the chamfered or bevelled shoulder I2 is brought into contact withthe bevelled shoulder 30 and, at the same time, the shoulder surface 33contacts the shoulder surface 34. Ihus, the nozzle tip IE, together withthe collar I8 having the metering disc l9, and the screen support 22 andscreen 2! are thereby supported within the nozzle tip adapter 29. Thescreen support 22, together with the screen 27, project outwardly fromthe inner open end 35 of the nozzle tip adapter 23.

The open end 35 may be inserted within a hole in a boom supply pipe suchas 33, and is brazed or welded thereto as at 31 to make for positivepositioning of the adapter 29 in the supply pipe 36. Old forms ofnozzles have an adapter which is screwed into the supply pipe, and as aresult of frequent removals, the positioning of the adapter upontightening is thereby changed.

An important feature of my nozzle is the orifice l3 and the method offorming the same. The orifice I6 is formed in the following manner: Thehobbed depression 38, as illustrated in Figure 10, is formed in the endM of the nozzle tip H) by forcing the hardened hob tip 39 into the innersurface 40 of the tip l4. This is done by inserting the hob 4| in apress and bringing the hob tip 39 against and into the surface 43 andforming the hobbed recess 38. The hob 4| is inserted within the tip l0and the hobbed recess 38 formed before the threads I5 are formed in thenozzle tip l0, allowing the hob 4| to fit filush with the inner surfaceof the tip l0, thereby positioning the hob tip 39 accurately upon thesurface 40. As a result of the hobbing of the hole or recess 38, thedensity of the metal surrounding the hole 38 is thereby increased and asa result is hardened.

After the hobbed hole or recess 38 is formed. the transverse V-shapedmill cut or a cut formed in any other manner 42 is made in the forwardend M of the nozzle. The depth of the mill cut 42 is of such a depththat the lower portion of the hobbed hole 38 is thereby exposed formingthe orifice I6. When the hobbed hole 38 is curved, as illustrated inFigure 10, the orifice formed by cutting therethrough with the V- shapedmill cut 42 is elliptical in shape, as shown in Figures 2 and 12, andthereby produces a fantype spray. The mill cut 42 is broadened as at 43for the purpose of confining or directing the spray issuing from theorifice IS. The bottom of the mill cut 42 is illustrated by dottedlines, as in Figure 11.

It is apparent that the recess 38 may be formed in hardened metal bymeans of cutting or grinding the same or by any other appropriatemethod.

My spray nozzle A is assembled by first screwing the support collar [8into the bottom of the nozzle tip 10. The cylindrical screen 27 is thenslipped onto the fluted screen support 22 while the cap 25 is thenscrewed against the upper end of the screen 2! and the support 22. Thescreen support is then screwed into the upper inner end of the tip 10 asillustrated in Figure 6. The above unit is then slipped into the adapter29 until the shoulders l2 and 30 come into contact. The compressionretaining nut 32 is then slipped over the end 14 of the tip l0, andengaged with the threads 3| of the nozzle tip adapter .29, and drawn uptightly with the end 14 in position to direct a spray at the desiredangle.

With an elliptical orifice l6, as hereinbefore described, the nozzle Amay be positioned in a boom supply pipe at spaced intervals, as shown inFigure 5, giving complete spray coverage of ground area by means of theslightly overlapping fan spray areas created by each of the nozzles. Mynozzle is used principally with selective plant exterminating chemical,such as 2-4D as known in the trade, or any other liquid or liquidmixture to be sprayed.

My nozzle may be used for spraying material of high viscosity or anyapplication of liquid material containing a high concentration of solidsin suspension, because of the self-cleaning action due to the design andconstruction of the parts of the nozzle.

The advantage of the nozzle tip H1 having the bevelled surface 12 whichcontacts the bevelled surface 30 of the adapter sleeve 29 is apparentwhen it is desired to align the tips I with the adapter sleeve 29 or asupply pipe boom supporting the adapter. The shoulders I2 and 30 arebrought into light contact with each other by means of the locking nut32. Because of the light contact of the shoulders, the tip l0 may thenbe rotated into correct desired pro-determined position, following whichthe nut 32 is drawn into tightened position, thus bringing the shouldersI2 and 30 into tight contact with each other. As a result of theabove-mentioned bevelled shoulder contact wedging of the tip with thesleeve, the tip l0 remains in the position in Which it is placed underlight contact and is not rotated by the tightening up of the locking nut32. Where the shoulders l2 and 30 are formed right-angular, thetightening of the locking nut will rotate the nozzle tip from itsdesired position.

I claim:

1. A spray nozzle including a nozzle tip, a metering disc removablysupported within said nozzle tip, a nozzle tip adapter adapted to engagewith said nozzle tip, means for maintaining the engagement of saidnozzle tip and said nozzle tip adapter, a screen support having flutesformed longitudinally thereon and removably secured to the upper innerend of said nozzle tip, a screen positioned on said screen support, andan annular bevelled edge formed on the upper end of said nozzle tip tocontact and confine the lower edge of said screen, a screw cap removablysecured to the upper end of said screen support, an annular bevellededge formed on the under surface of said cap engageably with the upperedge of said screen; an orifice formed in the lower end of said nozzletip, and a channel formed in said tip intersecting said orifice.

2. A sectional spray nozzle including a tip member, a small orificecentrally disposed through the end of said tip, a transverse slotintersecting said orifice in said tip, a turbulence chamber formed insaid tip adapted to cause liquid injected into said turbulence chamberto wash said chamber clean of any residue, an adapter sleeve adapted toreceive the inner end of said tip member, bevelled surfaces formed onsaid tip and the end of said sleeve which are adapted to engage one withthe other, a locking collar adapted to draw said bevelled surfaces intocontact with each other to form a liquid tight joint in connecting saidmembers, an elongated longitudinally extending screen for straining theliquid before entering said turbulence chamber, a bevelled inner surfaceon the inner end of said tip adapted to engage one end of said screen, afluted longitudinally extending core member threadedly engaging with theinner end of said tip and adapted to support said screen withlongitudinally extending flute recesses, a screen looking head having anannular inner bevelled surface adapted to engage the inner end of saidscreen and threaded to said core to lock said screen with one endthereof bearing against said bevelled surface on the inner end of saidtip and the other end thereof bearing against said bevelled surface onsaid locking head.

RALPH H. MUNSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 679,733 Edgell Aug. 6, 1901791,889 Ellis et al June 6, 1905 960,150 Binks May 31, 1910 1,186,155Worrell June 6, 1916 1,760,373 Perrin May 27, 1930 1,795,314 PhillipsMar. 10, 1931 1,889,201 Holveck Nov. 29, 1932 1,972,001 Witham et a1.Aug. 28, 1934 2,062,362 Hubbard Dec. 1, 1936 2,130,854 Murphy Sept. 20,1933 2,151,271 Hassig Mar. 21, 1939 2,439,257 Lum Apr. 6, 1948 2,517,555Fulton et al. Aug. 8, 1950 FOREIGN PATENTS Number Country Date 376,574Great Britain July 14, 1932

